基元类型
2016-04-20 11:12
211 查看
编译器直接支持的数据类型称为基元类型(primitive type)。基元类型直接映射到FCL中存在的类型。比如在C#中,int直接映射到System.Int32类型。
checked和unchecked基元类型
对基元类型的许多算术运算都可能导致溢出。可以通过全局性的打开编译开关(项目属性-》生成=》高级=》检查运算上溢/下溢),
![](data:image/png;base64,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)
也可以使用操作符checked和unchecked来实现
Byte b=100;
b=checked((Byte)(b+200));//抛出OverflowException异常
checked和unchecked基元类型
对基元类型的许多算术运算都可能导致溢出。可以通过全局性的打开编译开关(项目属性-》生成=》高级=》检查运算上溢/下溢),
也可以使用操作符checked和unchecked来实现
Byte b=100;
b=checked((Byte)(b+200));//抛出OverflowException异常
相关文章推荐
- 定义filter对session过期用户重新登录
- 训练2 15题
- 2016年3月23日作业
- 线程池问题,求大神解释
- ubuntu ~/.bashrc 常用修改
- VS2013集成yasm 1.3.0 含Windows10/VS2015特别说明
- 求整型 数组中最大值和最小值元素的距离
- java web笔记-tomcat
- 2016腾讯实习生招聘_基础研究 面试心得
- 正则匹配去掉字符串中的html标签
- C++ 解析CSV文件
- Oracle 记录类型介绍
- 通过代码实例来说明spark api mapPartitions和mapPartitionsWithIndex的使用
- C命令行参数存入argv数组的规则:
- WorkFlow常用的一些情形
- MySQL数据库插入乱码
- org.apache.jasper.JasperException: Unable to compile class for JSP 问题
- USB驱动开发(五)之程序设计
- POJ 1088 滑雪 (记忆化搜索)
- 数据库连接参数解释